确保ssl可用性后重定向到https

Question

我正在使用此代码重定向

  If Not Request.IsSecureConnection Then
        Dim url As String = Request.Url.ToString().Replace("http:", "https:")
        Response.Redirect(url)
        Exit Sub
End If

现在我只想在我的网站上提供ssl时重定向到HTTPS。 那么如何检查ssl可用性呢？

Answer 1

使用https://stackoverflow.com/a/5378470/2012977创建的函数可以帮助检查网址的可用性。见下面的例子。

public bool UrlExists(string url)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Timeout = 15000;
        request.Method = "HEAD"; 

        try
        {
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                return response.StatusCode == HttpStatusCode.OK;
            }
        }
        catch (WebException)
        {
            return false;
        }
    }